To run this command automatically on each boot add it to file named /etc/rc.local.
If you do not have such file, create it.

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
outl 0x1854 0x2000
exit 0